Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. MJD2873J

Name: MJD2873J
Brand: Nexperia USA Inc.
SKU: MJD2873J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MJD2873J

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: MJD2873J.pdf

Description:: TRANS NPN 50V 2A DPAK

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:53

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MJD2873J from Nexperia is a 50 V, 2 A NPN high-power bipolar transistor in DPAK (SOT428C) surface-mount package, designed for linear-mode voltage regulation, load switching, and motor drive circuits where low V_CE(sat) (0.3 V typ.) and high thermal dissipation (15 W junction-to-mounting-base) are critical.

For engineers reviewing the MJD2873J datasheet, MJD2873J pinout, MJD2873J application, or MJD2873J equivalent, key selection criteria include verified DC current gain (h_FE = 40–360), collector-emitter breakdown voltage (V_CEO = 50 V), peak pulse current capability (I_CM = 3 A), and thermal resistance to mounting base (R_th(j-mb) = 9 K/W).

Technical Context

This NPN power transistor operates in active, saturation, and linear modes with specified h_FE minima at I_C = 2 A (40) and I_C = 0.5 A (120), enabling stable biasing across load ranges. Its low V_BE(sat) (1.2 V max at I_C = 1 A, I_B = 50 mA) supports efficient base drive in high-current switching applications.

The device features a thermally optimized DPAK package with mounting base electrically connected to the collector, delivering R_th(j-mb) = 9 K/W in free air and supporting up to 15 W power dissipation when mounted to an external heatsink via the base pad.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum allowable collector-emitter voltage with base open; defines safe operating voltage ceiling in switching and linear applications.
I_C	2 A continuous - Rated DC collector current; determines maximum steady-state load-handling capacity without thermal runaway.
V_CE(sat)	0.3 V typical at I_C = 0.5 A, I_B = 50 mA - Low saturation voltage minimizes conduction loss and self-heating in switch-mode operation.
h_FE	40–360 - DC current gain range across operating conditions; enables predictable base current sizing for 0.5–2 A collector loads.
R_th(j-mb)	9 K/W - Thermal resistance from junction to mounting base; quantifies heatsink coupling efficiency for high-power linear regulation.
P_tot (j-mb)	15 W - Maximum power dissipation achievable with proper mounting base thermal interface; sets upper bound for linear-mode power handling.
f_T	65 MHz - Transition frequency at V_CE = 10 V, I_C = 100 mA; indicates usable bandwidth for medium-speed switching (e.g., PWM up to ~5 MHz).

Pinout & Package

Package: DPAK (SOT428C) - Surface-mount plastic package with exposed metal mounting base (pin 3 equivalent), optimized for thermal transfer to PCB copper or external heatsink. Mounting base is electrically connected to the collector terminal.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Control electrode; requires ~50 mA base drive for full 2 A collector conduction; low V_BE(sat) eases driver design.
2	Collector (C)	Main current input; internally bonded to mounting base (pin 3); must be routed to thermal pad on PCB or heatsink for power dissipation.
3 / mb	Mounting Base (connected to C)	Thermal and electrical extension of collector; provides primary heat path; requires soldered thermal pad area ≥1 cm² on FR4 PCB.
Emitter (E)	Emitter (E)	Current return path; referenced to system ground in common-emitter configuration; low-impedance connection required for stability.

Key Features

Feature	Design Value
Low V_CE(sat)	0.3 V typical ensures ≤0.6 W conduction loss at 2 A, reducing thermal stress in constant-current and linear regulator topologies.
High P_tot (j-mb)	15 W rating enables use in 5–12 V, 1–1.5 A linear regulators without auxiliary heatsinks when properly mounted.
Fast switching	f_T = 65 MHz supports clean turn-on/turn-off in PWM-driven motor control and backlight dimming up to 100 kHz.
Robust thermal derating	Power derating curve maintains ≥1.6 W ambient-rated dissipation on standard FR4 PCB, simplifying thermal layout for industrial designs.
Electrically similar to MJD2873 series	Drop-in compatibility with legacy MJD2873 variants allows direct replacement without circuit revalidation in existing production.

Applications

Linear Mode Voltage Regulator

Load Switch

Use Scenario: Adjustable 3–12 V, 1–2 A linear regulator using emitter-follower configuration with feedback control.

IC Role / Device Role / Timing Role: Pass transistor regulating output voltage by modulating collector-emitter conduction in linear region.

Use Value: Low V_CE(sat) and high h_FE minimize dropout voltage and base drive loss, enabling >92% efficiency at 2 A output.

Use Scenario: High-side or low-side ON/OFF control of 5–24 V DC loads (e.g., solenoids, fans, LED arrays) up to 2 A.

IC Role / Device Role / Timing Role: Power switch controlled by microcontroller GPIO or logic-level signal via base resistor.

Use Value: Fast switching and low saturation voltage reduce transition losses and heat generation during frequent toggling.

Motor Drive

Constant Current Backlighting

Use Scenario: H-bridge half-bridge leg or single-ended drive for brushed DC motors (12–24 V, ≤2 A stall current).

IC Role / Device Role / Timing Role: High-current switching element handling bidirectional or unidirectional motor current with PWM control.

Use Value: 3 A peak current rating accommodates motor inrush; f_T supports clean PWM edges up to 50 kHz for torque ripple reduction.

Use Scenario: Constant-current sink for white LED strings (e.g., automotive interior lighting, industrial panel backlighting).

IC Role / Device Role / Timing Role: Linear current regulator maintaining precise LED current despite supply or forward-voltage variation.

Use Value: Tight h_FE consistency and low thermal drift ensure ±3% current accuracy over −55 °C to 150 °C junction temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-power bipolar transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MJD2873T4G	Identical V_CEO, I_C, and package; h_FE min = 30 (vs. 40) at I_C = 2 A; R_th(j-mb) = 10.5 K/W (vs. 9 K/W).	Slightly lower gain and higher thermal resistance limit use in margin-constrained linear regulators above 1.5 A.	Select when cost sensitivity outweighs marginal thermal or gain margin; verify base drive裕度 at full load.
STMicroelectronics BD237	V_CEO = 60 V, I_C = 2 A, TO-126 package; no mounting base; R_th(j-a) = 60 K/W (vs. 79 K/W for MJD2873J on FR4).	Requires external heatsink for >0.5 W dissipation; unsuitable for compact SMT-only designs relying on PCB thermal mass.	Choose only if through-hole assembly is mandatory and board space permits discrete heatsink mounting.

Compared with MJD2873T4G and BD237, the MJD2873J offers superior thermal performance via its integrated collector-mounted base and tighter h_FE spec, making it optimal for space-constrained, high-reliability linear and switching applications on standard FR4 PCBs.

Availability

MJD2873J is available at Aetrix Electronics and suitable for linear mode voltage regulators, load switches, motor drives, and constant-current LED backlighting applications requiring stable component supply, consistent parametric performance, and long-term industrial lifecycle support.

Supply support for MJD2873J includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade power transistors.

The MJD2873J belongs to Nexperia's high-power bipolar transistor product line, engineered for robust linear and switching operation in industrial power management, motor control, and lighting systems where thermal efficiency and parametric consistency are critical.

FAQ

What is the maximum continuous collector current for MJD2873J?

The MJD2873J is rated for 2 A continuous collector current (I_C) under specified thermal conditions. This rating assumes proper PCB thermal design-specifically, a 1 cm² tin-plated copper pad for the mounting base on FR4-and ambient temperature ≤25 °C. Derating applies per Figure 1 in the datasheet.

Is the mounting base electrically isolated from the collector?

No-the mounting base (mb) is internally connected to the collector (pin 2) and forms part of the same electrical node. This connection is explicit in Table 2 (Pinning information) and Figure 11 (package outline), and must be accounted for in PCB layout to avoid unintended shorts or grounding conflicts.

Can MJD2873J be used in avalanche mode?

No-MJD2873J is not rated or characterized for avalanche energy handling. Its absolute maximum V_CEO of 50 V is a DC blocking rating only; operation beyond this voltage, even transiently, risks permanent device failure. External clamping (e.g., TVS diode) is required in inductive switching applications.

What is the recommended minimum base resistor value for 3.3 V MCU drive?

For reliable saturation at I_C = 2 A, a minimum h_FE of 40 requires I_B ≥ 50 mA. With V_BE(sat) ≈ 1.2 V, a 3.3 V MCU GPIO yields R_B ≤ (3.3 V − 1.2 V)/50 mA = 42 Ω. A 39 Ω, 0.25 W resistor is recommended to ensure hard saturation and margin against h_FE variation.

MJD2873J Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 50mA, 1A

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 500mA, 2V

Power - Max:: 1.6 W

Frequency - Transition:: 65MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

MJD2873J FAQ

1.How can I place an order for MJD2873J through Aetrix?

Please submit a Request for Quotation (RFQ) for MJD2873J on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MJD2873J reliable?

The price and inventory of MJD2873J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MJD2873J is usually 5 days.

3.What payment methods are accepted for MJD2873J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MJD2873J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MJD2873J?

MJD2873J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MJD2873J order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MJD2873J?

For technical support, including MJD2873J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MJD2873J requirements.

6.How does Aetrix verify that MJD2873J is sourced from the original manufacturer or authorized distributors?

All MJD2873J products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MJD2873J meets industry standards.

7.What is the process for return or replacement of MJD2873J?

All MJD2873J units undergo pre-shipment inspection (PSI). If there is an issue with MJD2873J, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MJD2873J part is unused and in its original packaging.

Return procedure for MJD2873J:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…